Fuel-burner control



Jan. 5 1926. I 1,568,588

c. c. CUSHMAN FUEL BURNER CONTROL Filed April 11 1925 1 F4 Ila/enter lhzrles'a 00:11am

Patented Jan. 5, 19 6- i I UNITED STATES v 1,568,588 PATENT OFFICE.

CHARLES C. CI TSHHAN, OI AU BUBN, MAINE.

FUEL-BURNER com'noi.

' Application filed April 11, 1925. Serial K0. 22,801..

T all whom it may concern:

Be it known that I, CHARLES C. CUSHMAN,

- a citizen of the United States, residing at Auburn, county of Androscoggin, State of Maine, have invented certain new and useful Improvements in Fuel-Burner Controls, of which the following is a specification.

My present invention. has to do with 7 thermal regulation, as. for example, in the tern late is that of'excess heat as by spread In oil heaters the of re or explosion.

menace of such-is very great and the 'im-- portance of prompt and certain shut-01f of fuel supply is imperative to safety. The use of fusible members as well as thermostatic control in all such devices is old and has been successfully practiced, so as to have become recognized bases for such control. The problem has been to provide a system involving such a factor which could be ap-.

plied with the various. forms of equipment and surroundings of the average heating installations with which such a system is generally needed.

' My invention possessesa maximum utility by reason of its adaptability, which in turn is based on a simplicity,both of structure and operation.

.As illustrative of my invention I have shown in the accompanying drawings a system of considerable general applicability and yet of simple and efiicient construction. Throughout the specification and drawings, like reference characters are em'plo ed to indicate corresponding parts, and in the drawings:

Fig. 1 shows a somewhat diagrammatic view of a heater equipped with my invention.

Fig. 2 is an' enlarged view of the control valve lever. I

Fig. 3 is sectional plan view through the heater.

Figs. 4 and 5 are diagrammatic views of the weight control, and

Figs. 6 and 7am sections on the lines 6-6 and 7-7 of Fig. 2 respectively.

. In the drawings I have indicated at H a conventional heater of any type and for burner 'X located in a dra the purposes of the present case, it may be understood as being equip ed with an oil the fire box of the heater. The oil burner is fed by a supply pipe Z having main supply valve V controlled by a lever L and L. It has an overflow O which may be connected to any gravity cut off, (not shown). The lever L-carries a. s ring latch l to the end of which is attache a chain C which is anchored at some convenient oint as C This point C should be selecte -so that the lanyard C will normally tend to han in somewhat slack position as indicate in dotted lines, Fig. 1. It should preferably lie substantiall in the plane of throw of the lever L. ttached to the lanyard C isa weight W intended to move the lever L when the weight is released.

In the formshown, the weight is so positioned on the lanyard C as to be just below. the door D as that atfords'a convenient point of suspension of a ulley P. Over this pulley P is another exible member G atchamber Y in: I

tached at one end to the weight W and at the other end. to the fusible link F which is anchored so as to lieopposite the greatest point of danger, as forexample, oppo site the fuel burner opening where it would be most quickly melted by any excess heat.

lVhen so connected it will be seen that the weight W is supported by the link F" and theflexible member G and by the upper part of the lanyard C, so that it hangs without exerting any pullon the lever L.- If the link F is fused, the support of the weight is released on that side and the weight falls to .the positionshown in dotted 111188 in Fig. 5. In so falling it draws the catch L and permits the lever L to drop, thus turning off the fuel supply and preventing the spread of the fire.

By the location of the pulley P on the door D I provide for another emergency which, though fortunately unfrequent, is always liableto happen. In such burners there are frequently explosions due to accumulated as or the mixing of fuel. In case of suc an explosion, the door .D is blown 0 en usually without breaking"the fusible link unlessthere has been a flash in the air chamber itself. In either case, the weight WJfalls, releasing the catch and closing the valve.

,A chain E is connected to' a thermostat T which operates the valve in the usual manner to respond to the changes of temperature desired. The chain E may be confusible link F may be of any soft low fusing material having enough strength to support its share of the weight IV.

Various modifications may be made in materials and in arrangement of parts, as

' will be apparent to those skilled in the art,

all without departing from the spirit of my invention if within the limits of the appended claims. r

What I therefore claim and desire to secure by Letters Patent is:

1. In an oil-burning system, a supply control valve lever, a flexible lanyard attached at one end to said lever and anchored at its other end, a weight between the ends of the lanyard, a flexible support attached adjacent the weight and adapted to support the weight raised above the valve lever and a fusible link in the weight support and disposed in a danger zone.

2. In an oil burning system, a gravity supply control valve lever, a connection normally supporting the same, a release for said connection, a flexible lanyard attached at one end to said release and anchored at its other end, a Weight betweenithe ends of the lanyard, a flexible weight support to maintain the weight raised above the valve lever and a fusible link in the weight support an disposed in a danger zone.

3. In combination with a heater, an oil the weight and passed about said pulley and anchored adjacent the fire door to support the weight raised above the valve lever and a fusible link in the weight support and adjacent said door.

4. In a furnace having a door located in its upper part, an oil burning system, a control valve lever therefor, a flexible lanyard attached at one end to said lever and anchored at its other end so as to normally hang slack, a weight between the ends of said lanyard, a flexible weight support attached to said lanyard adjacent said weight and passed about a pulley on the furnace door to hold the weight against gravity and a fusible link in the weight support and disposed in a danger zone.

In testimony whereof I aflix my signature.

CHARLES C. CUSHMAN. 

